Spleaves

Re-implements the spleaves from the 2023 April Fools Update, and adds some new features to them! There are two types of spleaves:

• Regular Spleaves, which break when walked on, with more oxidized ones taking longer to break.
• Reinforced Spleaves, which don't break when walked on, and are great for decoration. Both types oxidize like regular copper blocks, and can be waxed in the same way.

Recipes can be viewed in the recipe book, or with a recipe viewer mod like EMI.s Update, and adds some new features to them!

Here is a small gif of the spleaves in action: